A hidden world of subterranean beings threatens humanity, a conflict rooted in ancient Earth history. Richard S. Shaver's controversial tales, originally published by the Shaver Mystery Club, explore a world beneath our own populated by the Teros, benevolent humanoids, and the Deros, a malevolent race of 'detrimental robots' who torment and devour humans. Shaver claimed to have discovered proof of this subterranean civilization, presenting his stories as fact-fiction to a dedicated readership. The narrative framework is that of personal revelation and presented evidence, aiming to uncover hidden truths about humanity's past and its potential future.

The Shaver Mystery Magazine, particularly its early issues, is recognized for its significant role in popularizing early UFO theories and occult discussions within a unique fact-fiction format. The magazine served as a primary outlet for Richard S. Shaver's controversial narratives, which generated considerable debate and inspired the formation of fan clubs. While Shaver's claims were often met with skepticism, his stories tapped into a public fascination with hidden worlds and ancient mysteries, making the magazine a notable artifact of mid-20th-century speculative literature. The publication's scarcity and its foundational place in certain subcultures contribute to its enduring interest among collectors and researchers of esoteric topics.